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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd77dac291f69b4b0429bfb0ab8dfec9892367fc767faa82248b31289e3ab272' 
  AND token = '8OpH1G/4ioFveQsaqLJ+tyy0CQLIDRMRj9gnGeu2Crc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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