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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9660319601190588ee31090b9600699e8f1ad32ec42ab91cb71a08209a523c4' 
  AND token = 'MJUqfnvXd1OAXSIDdSvNINsyBAVb8DFMnSPr6dFrSXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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