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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0f4f395486a0fde70fb526eec9984dc693943af133a7fd9c7ef4af4520b8e4' 
  AND token = 'gSd2VBP/oxjblgZ0oUNWB3kaEGzWY5axCC7lOEOuiUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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