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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decff6c4bb612e65f4a54e610802a7ef01c57fbcad9655c71f6c4451017165eb' 
  AND token = 'VzMR2KMqStViSYITw6vnb3BsAL0a0LTrAW2WpN6qCA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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