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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fe8ea80381a2f0b1f8e7f690044e927e11bc774f7bc262e30776b40b98d2cb' 
  AND token = '0Xd4cuM7XEq7sQEK+flhTsvTR3QJDABn1BsArtmXGQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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