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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f9e9c9015f3d12c8d30d1ed4a4e886035414bc98e7d558fe6cb3b701fde903' 
  AND token = 'cc4BuLO7WW6fEuj/TipjUkFt2zhr6bmNzX6mzo8Xf1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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