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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a41f9f3b1042b1d77d91ca795c0b29c67f100aa49ccec2aa6f50a5cb72f06e7' 
  AND token = 'g4KpZDsT9Wbo85cygCHtLWnqpoTmozdGGa2Lep+0Mo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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