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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2960138963e623d94ec860a8e02017b3f355f3ffaec8588e49eff19d37629532' 
  AND token = 'KDaR7nOKR8J7HpCJe+LxOb2685RxA4zPit/GZJ/nZlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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