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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99a0e2d6a35ece46dcb0cd1b16b2bb32cbc2279959cb1e3517869979321555e' 
  AND token = 'Srz4pE5yg+zyIBcKCvXcgAt+daF5taT6aiVktFZKnME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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