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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d316297f8d81cbd8be6cc5222a8b468ce5686db65515c3b31b81aec1a692f9' 
  AND token = '8UHBtn6L2gGL2XONwZavjzNhygS7Zq6hcm1iuA3IolY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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