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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ab46d8af8ab137de682208373f94a28c82c7ccafbf29d75b72e6135aacf78c' 
  AND token = 'mWaffTayHxmBHIZSjPK/3GnjPQ6O9J99h+/08L2t+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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