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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617ffc77bc502a35d377d8ecf123725f8b772a296ffd55bdaeddb6834e03fd77' 
  AND token = 'P92UEy7/0zPBnNk5mM4C/3rEgM2xrbZU2xO00OsRgpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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