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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366747370a1dd16ef779a4cfd69ee871809987e64748448d0df8f1229b5bc0d1' 
  AND token = 'wLIdsLLK4dF02W9aA5xUSxf3xplOpFNS0dy6Ol59heA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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