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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11721c687c0f9b3348bbd87166ad8ee26b5ce2d91b0b47f037e917ef7fab167e' 
  AND token = '1TgfH3xICcAA35bSuXjgcj1NZXHg2N3h168ApLPOUjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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