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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f0f8f45db6ebb709a968c012ddbe23486d81c7a83b7ff04b081c876dacec5b' 
  AND token = '9y504YEAJqugGFGfJEUn/O5Haou5wwJxR4/jOXdUwM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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