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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9e85dee183ee9dd094fcc223a6b0a22473947a1e87beafe0d44fe906a70383' 
  AND token = 'efpLUzMO640NNWx5kyOiXfo7E85Jj22Vn3sKPLaVnTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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