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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03110853628f4c5d79ffc1ba82d8499938c1793067c60569dd40c8904f0b31ab' 
  AND token = 'oC97g1KOPwUwKA/szs/CLIheN7IfFiuvg53EqCPkbSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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