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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e399dcb935eb83e98c5c72ac28e67cfc013e0d0d022d51ed66cafa52a2bf34' 
  AND token = 'WmsJaReHF4JMG8TD3UNQ/ayNyMpiCTKy0CBNvlLYHEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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