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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e171cad7b75c0b134b566a2c4f7b3a4f774ce5a4695bcbf91d71371b683ceb' 
  AND token = 'qADaK/y9duic9LNdtii8aaLJfXtoPc4xjFZrJY/NR5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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