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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9778a91f1854cef50868060b4759ee27fdfda0fd0f306d80da5834b074be469f' 
  AND token = '3PL45IQy1M2BeiCKgIGi+3ta3r/GLrvkcCQBhw4B+OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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