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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8af23bf647f0fbdb733825d0d16b94c9b756c987720eda88580ef8440e382a' 
  AND token = 'qoTvnZH9R29LyyZYi4lNI1qgjVjua2p6PfWTEvL/toU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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