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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfae176d60a23fbbc2942bbeae3429c9d7dec540aa3210f05604e24d20009051' 
  AND token = 'ftQ2jCm8ka3XzxpqEvO8XCS0vTQMFnHyrDg/blENcXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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