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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9484288ec638efb694bd9466c0719e6f67b8e974789911a589c7c5267e49972' 
  AND token = 'rR0VN/7VVGAPwktDdQ5C6pYqwlR1/gCb2DXVjxy1yrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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