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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abfefb6ac17854fcd895d4c7bd59aa5ab1b0b4c809aae579a32c4efa1e9c8e3' 
  AND token = 'Fdq4fTG36VLVGQsMA2iMc1nwJR8W06Ct5tY3YmA6QUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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