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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5105989a1859f7983611d9ee1e4c59b32425f3c7b3c5f1458ba525fa607e4b' 
  AND token = 'OblnCCJhMjUhE28FiYZ1MDIj/K4nk6igyH1b8ktVp3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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