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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee24e51128b7ccb75f5053e7a33d31e49b79a29a313e980d917f22aac6e34da' 
  AND token = '0SzImSq0LZDbSlB5hQCWa3MlV7G4zC+fsb0yqpyyGYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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