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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123ae4915c74fbe7f063b06c0f3b7fefd5b003de768672486efc2f17ceae621c' 
  AND token = 'lq9nHKnLebnlN8QXIqiH7h5Uyyw9YEKAEyKdUDkQpEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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