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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7ebd006b3f48835ea0243f760e9a15eace49c9235232c476ae94e913f660d6' 
  AND token = 'sC9yjVVLNYWYtf1L1oAi5MDIt9nRioiqcKCjA/eTyXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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