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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8241d41fda8e351fca4b7d77492c7c06e2e4acb4d5a331430fba79f841916345' 
  AND token = 'GIlt1xRwLtOEuebQXTEKnHQCnRcohQrlquKuUYMHtZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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