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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb1aa35e5a6c4390a94321d7667ee6c0ccb70709a8394b24e54c2bc2fc9ac2b' 
  AND token = 'jFZnownp0eG5+vvNFQDmbv7JckUzAImvvs7K+XjnKC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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