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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18d7b5bda98dfceaac86f210495c2dc5dea4a8ec9d888c7e52d82cc2dd2af90' 
  AND token = '3AhtibrT5pKvkqeJLxKePRHBMJKQkkGS7x82lo/ktAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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