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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea8fd4b6889381b6fd7a834a06331243418b6c064f4113a43336aa35f7609a7' 
  AND token = 'RpD/HYgDHaJZe1RRkuHzNl4gYvGRDc5GzIrUoaNcv4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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