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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dd3568c6172eb2b5253eeb20e60161bef1b04cf5de39e63e899682d410f98b' 
  AND token = '0q+zm4vScBpXTNIiPkrqgQOZbLag2FeUYH0V1lf1pWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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