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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959b28f49baf927b50d1ce9bd8101280d511c0ca3f42f74921e15df979750a45' 
  AND token = 'fC0giaRzVf9bTK1aGSbb9BEesB/xwS9F//b9hPpsqSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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