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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e56efc7149a3fcd9f2e21e01622d40632a55221a6835c9eba3d99a2bb3799d1' 
  AND token = '6futa7S9sL/UFc5qzuZbmRrOwt5Hc4OoLO8HJxuMOE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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