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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7576cbe3c2e9afd9d4f6fd446322830a3d1d3e6c36331edd3baa5ce3ffdf81d' 
  AND token = '6/hM9jmfdRoOIH7eANbLy+TLtklScxZs+VNsfMZLBDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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