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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e067b31d9a042071170b0a8cebd124ccca2a837638048f84eacd728da14806' 
  AND token = '6x5juxCn/Ohfjt7CoLiCKN+MqrjYEFV2YPhOZo5Mj1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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