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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fdc44262c084434ec6d89fa526d943f44e36d797ebedfe3e95f17e43a3a4a3' 
  AND token = '4+DwkOcL0drmDXIn6hbWBKf7EOP7SoxJDHR3Karf0Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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