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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb50be49203ab0833adf4b7c200db56d9545f838573ab44eac44eb7ec2f1f79f' 
  AND token = 'XONSkqxskkA3lfBxnT7HYDSw12LrhS5/LRlgu/+bl+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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