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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5214f483591af7fcb35ba0c754beb24c80359dd936bb1db6731fc2cbb74f2341' 
  AND token = '4Zlqu0a9zsZNbr9m6imMJIqzIBqinHtU8y3Nvxahm74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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