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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b7b7ab4b27cbf6f865c44c393764ec79da890c55b3ed02b9140d8212f19ff9' 
  AND token = '7sbi9V6uR4WEcu6KX9NKXy5MYiFFOzAsbgSSn1xoVk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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