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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daccd19da9eb5446a65624565cf4b7afd01e6d06328e3b518af387de0df7e858' 
  AND token = 'XzJR5F1Abyu7f3uFpWaxxjEysAGI7sIDDS0+gKu5UB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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