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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06938d81a40dd773067d08e6bef28a1a95281be78320165c960d98fa887bb74' 
  AND token = 'hAWFDj2b2v2eB9QWUVWgb2jlMrvj21KGJlyD+cB82yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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