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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d063f710e2d0535ca61677fdd03d9949a09e8860785a6a12e5aa6dedec42ad5' 
  AND token = '/z3WAwJPBg2vDPO8YGtjrLE5vvNc0YMKRaLK8LMcbL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}