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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b522387441d39d1a95af6d792405959b72510f24155009173f18824872a7cfe2' 
  AND token = '0MyePtuhoiZeltheVJ47eCwsy3KfVkBXUgCMf2XjOxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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