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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ced2a9a122ab6e38077e52c84063c78b71a36737f6173c051a077cdd93c83d5' 
  AND token = 'ZjIyryFnuf4mBiAeatH6icsL42t3ONUtyyM/xmWUAc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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