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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332dd3de6d5feefaa943aa0dd1465609eb20e0040a40be7dae89d6ca5cbfd408' 
  AND token = '6hEWU6DwqUeY2Dy33SM8xqP78XgTBf035xXuzC4ZDvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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