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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c441daca01f12f8eaea5ba04ca91966b5a055c729ae1bc343e260eb51afffe55' 
  AND token = 'GAMgwGmI9e27MKudrLphH6q4jx3Ga8RZ+ym8HVuu6m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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