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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b67719048b94cd92ca5b3cb97a566a457ac5e02e921d203f783e814bcb79c19' 
  AND token = 'kIN/4LdGP7t2CBieJ5CNq9apDY/vJE2g9M5waDugScg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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