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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e378d80c879cf5fb0a4f57940bfbb58f28a7cfebc82aab5692a3c2df53dc2ad0' 
  AND token = 'C2uSxyP3g35J8zZVfoDUd0Tdwi6Vy7bNndGTFEJSZQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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