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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f0adae78b0a5b9fe16c4e9fd4161817aa8d86c1bfb962cf7201c45abca69e0' 
  AND token = '9J2kHXpAv1pPDyF7V2mE64m6Bj8gF7RClC/z+Ze0XAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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