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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a1534304252b5646f8e8a0141e68d8cd03dd0268313f6f94062888b3a0ab4b' 
  AND token = '6G4kSyzMLeiUnmfktdN5wzKZRnx5S3RLroIrZSklIhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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