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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bdd905a9182970daaa1c858d755b66006d80b7a21d9757de10f7824c89cb36' 
  AND token = '816LWtXBvIYEtc5b2ODNocHida+fBENK3wlhEoiste0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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