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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cb8192bb4d95032c07b200cc3d6409bb0b6baa52f4d7bdd4f310dfc44299aa' 
  AND token = 'ji/2ypcqXH88v1lCCVi5iVY0mdS4eRr9+mOF9Igeh7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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