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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fe0108f5834fba5068fa868ea2d4215041cfc98a8f3b5e97a6c3c6f5c88fc5' 
  AND token = 'QnHyEuE6V+AIPdgiCRnsDijHRkc8qX6dr8WX6PYtCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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