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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4af98cf0a35705d78c8b14ba68138d19d1a4c6b72576d0692cc13741f8dfd3' 
  AND token = 'zMXtuZUC0oi6VXk+Uny9/0bW4x5ebGimUwbCsVBs3zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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