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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4f8b0da5e5e911e93ed340ca5c19c4b88f2a4d2bc9040d1a4147aa2bde7a2b' 
  AND token = '3bEJ4paoegjCXKtTME9JaW/VJaOktEy8YdO1Pe9KKHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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